Synchronizing system



June 27, 1933. CONNERY 1,915,518

SYNCHRONIZING SYSTEM Filed Dec. 23, 1931 INVENTOR ALDER E CONNERYATTORNEY Patented June 27, 1933 STATES PATENT nnnnn r. oonnnny, ornn-ooKLYn, NEW YORK, ASSIGNOR TO INTERNATIONAL COIVL MUNICA'IIONSLABORATORIES, INC., on NEWABK, nnw JnnsnY, a conronarron on NEW roanSYNCHRONIZING SYSTEM My inventionrelates to telegraph systems, and moreparticularly to a typeof corrector system foruse withsynchronoustelegraphy.

Telegraph systems of this type usually comprise two or more commutatorsor distributor's with means for maintaining the brushes of saiddistributors in synchronism witheach other.

As is well known in the .art, when the brushes'at the receiving end ofasynchronous telegraph system are out of phase with those at thetransmitting end, it is necessary to providemeans for stepping thebrushes back into phase at frequent intervals.

The object of my invention is to provide a simple correcting systemwhich will function to step the brushes back at frequent intervals byutilizing the si nalling impulses, thereby eliminating the loss oftransmission time. v In order to accomplish the correcting reemploy adifferentially wound looking relay which is controlled in part by theline relay responsive to the transmitted impulses, and in part'by theco-operation of certain mechanical partsjassooiated'with thedistributors 1 I Various features of my invention will be pointed out-inthe description to follow.

The single figure in the drawingshows the preferred embodiment of myinvention.

Referringto the drawing: A drive shaft do for the distributor, driven bymeans not shown, carries a fly wheel 50 and a freely rotating brushcarrier 47. The

a brush carrier has a gear wheel lSformed integral therewith, whichmeshes with a. pinion 39 secured to a short shaft which is journalled ina control disc ll operatively secured to shaft by any suitable meanssuch as pin l2. The other end of the shaft-4O has a star wheel 46'secured. thereto which is prevented from rotating by a springactuateddetent roller 49 carried by control disc 4.1. The magnet 15 isprovided with an armature 17 which, when operated, bringsthe pinlSintothe path of star wheel 46. l

The arm 13 is controlled by a projection 44 on the disc ll forcontrolling the circuit of magnet 15.

Apolarized line relayis shown. 1, the

tongue of which is connected to the winding of polarized relay 2. Thetongue of relay 2 follows the received line signals. When the tongue ofrelay 2 is resting against its spaclng contact S, the condenser 3 willbe discharged through resistanceel. W hen a marking signal is received,the tongue of relay 2 will move over to the marking contact M and thecondenser 3 will be charged from battery 5. The charging current forcondenser 3 will always flow through the windings of locking relay 6, Ifthe brush 7 is inproper phase relation with the received signals, thenbrush 7 will be on the B segments at the instant the tongue of relay 2arrives at its marking contact, and the charging circuit of condenser 3will be as follows: from battery 5, through condenser 3, marking contactM, windings 8 and 9 of relay 6',seigment B, brush 7, and thence throughsolid ring 10 toground. It

should be noted that the charging impulse goes through windings 8 and 9in series and that these windings are connected in opposition. Sincewindings 8 and 9 have an equal number of turns, it will be apparent thatthe armature 11 of relay 6 will not be operated.

The resistance of windings 8 and 9, however,

limits the charging current of condenser 3 and thereby prevents damageto the contacts of relay :2 or the distributor segments and brushes..vVhen the brush 7 is out of phase with the received signal, the brushwill be on the A segment at the instantthat the tongue of relay 2arrives at itsmarking contact.

The path of the charging impulse of condenser 3 will be as follows: frombattery 5,

through condenser 3, contact M, winding 8 of relay 6, segment A, brush7, solid ring 10, and thence to ground. Since the charging current, inthis case, passes through only one winding of locking relay 6, thearmature 11 will beattracted and the relay will lock up through thefollowing circuit: ground, battery 12, contacts 13 and la, winding ofcorrector magnet 15, tongue 11, winding 16, and thence to ground. Theenergization of magnet 15 will attract armature '17 which will cause thepin 18 to be placed in the path of star Wheel 46. At a certain point inthe revolution of the distributor the pin 18 will engage the star wheel46 and cause the brushes to be'stepped back a small amount, which willtend to put the brushes into the proper phase relation with the receivedsignals. Immediately after the pin 18 has engaged with star wheel 46,contacts 13 and 14Ywill separate momentarily, thereby-unlocking relay'6. and die-energizing C-Ol'lOClJOl magnet 15. It

should bementioned at (this time that the cam which operates theunlocking contacts is not shown in the proper position with relationtostar wheel 46, but is merely shown in this position for convenience.It should be kept in mind that the brushes of the distributor arenormally running a trifle fast and it isnecessary that the brushesbe'stepped back at occasional intervals.

What'is claimed is:

'1. In a telegraph system, the combination ofa line relay for receivingimpulses of different characteristics, a condenser, a distributornormally rotating, a circuit arrangement whereby said condenser ischarged by; a change of impulses received by said line relay, acorrector relay provided with. two windings, and circuit arrangementswhereby said condenser charges through bothof said windings whenjs'aiddistributor is rotating normally and charges through but one'ofsaid windings when said dlSliIlbllt-Ol is rotating abnormally.

2. In a telegraph system, the combination of a rotating distributor,acorrector relay provided with two windings, a source of chargingcurrent, means for causing said charging current to fl ow through bothwind,

ings of'said 'corrector relay when said'distributor is normally rotatingand for causing charging current to flow through but one of saidwindings when said distributor is rotatingabnormally,

3. In a telegraph system, thecombination "of a rotating distributor, adifferentially wound'correctorrelay, a condenser -and a sourceof'charging current therefore asso ciated with said relay, means forcausing charging current to flow through the windingsof saidrelay inseries opposition when distributor is correctly phased, means forcausing charging 'c'urrentto flowthrough only one of said windings whensaid distributor is incorrectly phased, and. mechanical means undercont'rol'of'said difierential relay to correct said distributor phasingwhen a single winding only of said diiferential relay is energized. I gy 4. In a synchronizing system for telegraph apparatus, adistributorcomprising a rotatng contactor and fixed Corrector contacts operativelyassociated therewith, a driving member for said contactor, mechanicalmeans for angularly displacing said rotating contactor in respect tosaid driving means, a differential relay having, its windings con nectedin series opposition when said rotating contactor connects certain ofsaid fixed corrector contacts and having a single winding in circuitwhen said contactor connects other of said contacts, and means foroperating said mechanical means when said difierential relay isoperated, said operation resulting from a current flow through onewinding only of said relay.

5. In a synchronizing system, a distributor' comprising rotatablebrushes, solid and segmented contact rings associated therewith, and adriving means for said brushes, and means for adjusting the position ofsaid brushes in respect to said driving means, said last-mentioned meanscomprising a differentially wound relay controlled by the position ofsaid brushes on said contact rings, said relay having a current flowtherethrough at all times at which adjustment of said brushes ispossible, said current flow being I ineffective to operate said relaywhen adjustment is unnecessary. v i

, 6. A synchronizing system for telegraph apparatus, comprising a signalreceiving relay, a polarized relay connected thereto and operatedthereby, a distributor comprising solid and segmented contact rings,rotating brushes and driving means therefor, a'diff-erentially woundrelay having its difierential windings connected in series withmultiplied odd segments of said segmented rings and a singleone of saiddifierential windingsconnected to multiplied even segments of saidsegmented rings, mechanical means adaptedto adjust the angular positionof said brush with respect to said driving means said differential relayand associated mechanical means being: unoperated" thereby.

' 7 .In a system for maintaining synchronism between twoelectricallyremotely located rotatingbodies, driving means for said bodies one ofsaid driving meansnormally rotating more rapidly than the other, a line,

means for transmitting signals over said line at a speedregulated bysaid slower rotating body, areceiving relay operated by saidsignalsfapolarized relay operated by said receiving relay, adifferential relay operatedby current flow through a single windingthereof when said rotating bodies are electrically angularly-displacedwith respect to 'each other and said polarized relay armature is lyingon one of its contacts, said dif- "at afix'ed point in the cycle of thelatter, a I

said solid ring and one of said odd segments,

ferential relay being unoperated by a current flowing through both itswindings when said rotating bodies are in phase, and mechanical meanscontrolled by said differential relay for altering the angulardisplacement of said faster rotating body in respect to its drivingmeans to phase the slower and faster rotating bodies.

8. A synchronizing system for telegraph apparatus, comprising apolarized relay operable in accordance with received signals, adistributor comprising Corrector contacts and a contact brush, drivingmeans for said brush, means for angularly displacing said brush withrespect to said driving means, a difierentially wound relay in circuitwith said po larized relay and said corrector contacts, saiddifferential wound relay having its windings connected in seriesopposition when correction is not needed and having a single winding incircuit when correction is needed, and a corrector magnet cont-rolled bysaid dilierentially wound relay and operated only when saiddifferentially wound relay has current flowing through but a singlewinding.

In witness whereof, I hereunto subscribe my name this 22nd day ofDecember 1931'.

ALDER F. CONNERY.

